312131219 has 4 divisors (see below), whose sum is σ = 322200000. Its totient is φ = 302062440.

The previous prime is 312131207. The next prime is 312131233. The reversal of 312131219 is 912131213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 912131213 = 7 ⋅130304459.

It is a cyclic number.

It is not a de Polignac number, because 312131219 - 2¹⁶ = 312065683 is a prime.

It is a super-2 number, since 2×312131219² = 194851795748851922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312131194 and 312131203.

It is not an unprimeable number, because it can be changed into a prime (312131119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5034344 + ... + 5034405.

It is an arithmetic number, because the mean of its divisors is an integer number (80550000).

Almost surely, 2^312131219 is an apocalyptic number.

312131219 is a deficient number, since it is larger than the sum of its proper divisors (10068781).

312131219 is a wasteful number, since it uses less digits than its factorization.

312131219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10068780.

The product of its digits is 324, while the sum is 23.

The square root of 312131219 is about 17667.2357486959. The cubic root of 312131219 is about 678.3373589031.

The spelling of 312131219 in words is "three hundred twelve million, one hundred thirty-one thousand, two hundred nineteen".